Turtle back reenforcing casting for dipper doors



June 2l, D H MEYER TURTLE BACK REENFORCING CASTING FOR DIPPER DOORSFiled Oct. 4, 1929 @o O mi O i lfb (o Patented June 2l, 1932 UNITEDSTATES PATENT OFFICE DANIEL H. MEYER, OF ELKVVILLE, ILLINOIS,

ASSIGNOR T AMERICAN MANGANESE TURTLE BACK REENFORCING CASTING FOR DIPPERDOORS Application -led October 4, 1929. Serial No. 397,879.

This invention relates to improvements in the construction of dipperdoors, more particularly to the design of a reenforcing casting whichmay be attached to the excavating dipper to render it more vulnerableunder impact of heavy rocks which the dipper may handle in use.

The ordinary construction of an excavating dipper comprises a front towhich is attached removable dipper teeth and to which is rigidly secureda dipper back having connections for handling the dipper. A' dischargedoor is generally pivoted to the back of the dipper and serves to retainthe material in the dipper as itis moved to the place of delivery.Excavating di ppers are sometimes employed for handling large, heavyrocks and the discharge door will receive the impact of the rocks asthey are loaded in the dipper. There is therefore a tendency for thedoor to wear out at its center portion.

It is an object of the present invention to improve upon the design ofthe door and to provide a stronger construction which will give longerlife in use than present forms.

It is further an object of the present invention to form the surface ofthe door which faces towards the interior of the dipper in an archedformation, symmetrical with respect to two axes of the dipper door.

An additional object of the present invention resides in theconstruction of a 'turtle back reinforcing casting which may be appliedto the door of existing dipper designs and will provide a strongerconstructionV which will resist wear under rocks handled by the dipper.

Further objects of the present invention will be more readily apparentas the description proceeds in connection with the attached drawing inwhich:

Figure 1 is a transverse section through an excavating dipper showingthe door elevation;

Figure 2 is a plan view of the eenforcing casting which is designed tobe attached to the inner surface of the dipper door;

Figure 3 is a longitudinal section on the plane indicated hy 3er-3a: inFigure 2;

Figure 4 is a section taken transverse to impact of heavy door of an theplane of the section shown in Figure 3 along the line indicated 4w-4w inFigure 2.

In the drawing: l

Figure 1 illustrates the ordinary construction of an excavating dippercomprising a dipper frontl() having secured thereto by the rivets 11 adipper back ll-a. The-forward edge of the dipper front has removablyattached thereto dipper teeth 12 in the customary manner. The dipperback 11--a has formed therewith integral pivots 13 whereby the dipperstick may be connected to handle the dipper. has an integral connectingpivot 14 serving as a connection by pivot pin 15 with'the arm 16carrying a dipper door 17. Suitable latching means are provided as at 18for holding the door in closed position. It is general practice to formthe dipper door 17 having a plane interior surface and it will beapparent that when the dipper is used for handling heav rocks that theimpact of the rocks will be )orne primarily at the center portion of thedipper door.

It is the purpose of this invention to reenforce the construction of thedipperdoor and a desirable manner consists in forming the interiorsurface of the dipper door in a symmetrically arched shape such as shownby the surface 19. Thus, the interior surface of the door will havesubstantially a turtle back shape and the impact pressures of the rocksupon the center portion of the door Will be transmitted towards theedges thereof in lateral directions. It is of course apparent that theturtle back surface could be formed integrally with the door but apreferred construction consists in the provision of an integral castingwhich may be attached to the doors of existing dippers to obtain thedesired improvements.

Therefore, I have shown in Figure 2 a plan view of an integral casting20. The casting 20 is generally of elliptical shape in plan view and isarched along a longitudinal axis in Figure 3 and along a transverse axisasl `shown in Figure 4. A continuous edge 21 having a iattened lowersurface is formed around the casting whereby the edge 21 will atly seaton the plane surface of the dipper The dipper back also ,i

door 17. As shown in Figures 2, 3 and 4 rivet receiving openings 22 areprovided at spaced points around the edge 21 of the reenforcing casting.20 whereby the casting 5 may be rigidly riveted to the dipper door 17.

In order to further strengthen the arched casting 2O a longitudinal rib23 is provided `on the lower surface of the casting and joins with atransverse rib 24. The ribs 23 and 24 are substantially T-shaped wherebyHanges 25 and 26 are provided in the plane of the ed e 21 of thecasting.

t will be apparent that reenforcing casting such as illustrated may bereadlly designed to fit any of the customary shal es of dipper doors andwill rovide great y increased strength and resist wear of the door underthe impact action of .avy materials handled by the dipper.

Various changes and modifications may be `resorted to withoutdepartingfrom the spirit v of my invention as expressed in the appendedclaims.

I claim:

1. In excavating dipper construction, a dipper door and a renewablereenforcing casting secured to and substantially covering the innersurface of the dipper door.

-2. In excavating dipper construction a dipper door and a renewablereenforcing casting 'secured to the inner surfacel of the dipper door,said reinforcing casting being of arched. formation.

Y, `3. In an excavating dipper a dipper door and a renewableieeinfol'cin castin secured to the inner surface of said dipper oor,said reinforcing casting being of arched formation about two axes in theplane of the door.

4. A renewable reenforcin casting adapt- 40 ed to be secured to a dip eroor, the impact receivinff surface of said casting being of archedfaormation and integral ribs disposed on the under surface of saidcasting.

5. A renewable reenforcingcasting adapted to be secured to a dipperdoor, said casting i being of arched formation symmetrically above alongitudinal and a transverse axis, said casting also including integralribs disposed beneath the arched surface.

Signed at Elkville, Illinois, this 25th day of September, 1929.

DANIEL H. MEYER.

